I think one must avoid assuming that *all* extra command-line
switches are a problem. In this case, one option is to issue
makeinfo --help | sed -e '/INFOPATH=.*/p' -e 's/INFOPATH=//'
or some perl/awk/bashvars equivalent, with all the standard
possibilities of error, and the cost of starting sed (significant
on cygwin). Another is to use
makeinfo --show-manpath
which has a guaranteed action.
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